@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=Fira+Code:wght@400;500&display=swap');

:root {
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-teal: #2dd4bf;
    --accent-indigo: #818cf8;
    --accent-rose: #fb7185;
    --highlight: rgba(45, 212, 191, 0.2);
    --font-sans: 'Outfit', sans-serif;
    --font-mono: 'Fira Code', monospace;
    
    --status-green: #4ade80;
    --status-yellow: #facc15;
    --status-red: #f87171;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-gradient);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 1rem;
    display: flex;
    justify-content: center;
}

.container {
    max-width: 1400px;
    width: 100%;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 2.2rem;
    font-weight: 700;
    background: linear-gradient(to right, var(--accent-teal), var(--accent-indigo));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.2rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 1.2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    margin-bottom: 1.5rem;
}

.section-heading {
    margin-top: 1.5rem;
    margin-bottom: 0.8rem;
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
}

.input-section {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.sequence-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 104px;
    column-gap: 0.9rem;
    align-items: start;
}

.sequence-inputs {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    min-width: 0;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.clear-primers-btn {
    width: 100%;
    align-self: start;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    padding: 0 0.85rem;
    transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.clear-primers-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: color-mix(in srgb, var(--accent-indigo) 55%, var(--card-border));
    transform: translateY(-1px);
}

.clear-primers-btn:focus-visible {
    outline: none;
    border-color: var(--accent-indigo);
    box-shadow: 0 0 0 3px rgba(129, 140, 248, 0.18);
}

.params-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 0.8rem;
}

label {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

input[type="text"], input[type="number"], select {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--card-border);
    border-radius: 6px;
    padding: 0.6rem 0.8rem;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

input[type="text"] {
    font-family: var(--font-mono);
}

input:focus, select:focus {
    border-color: var(--accent-teal);
    box-shadow: 0 0 0 3px var(--highlight);
}

details.advanced-settings {
    margin-top: 0.8rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--card-border);
    border-radius: 6px;
    padding: 0.8rem;
    transition: all 0.3s ease;
}

details.advanced-settings summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--accent-indigo);
    font-size: 0.9rem;
    list-style: none;
    display: flex;
    align-items: center;
}

details.advanced-settings summary::-webkit-details-marker {
    display: none;
}

details.advanced-settings summary::before {
    content: '▶';
    font-size: 0.7rem;
    margin-right: 0.5rem;
    transition: transform 0.3s;
}

details[open].advanced-settings summary::before {
    transform: rotate(90deg);
}

details[open].advanced-settings .params-grid {
    margin-top: 0.8rem;
    animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

.analyze-btn {
    width: 100%;
    margin-top: 1.5rem;
    padding: 0.8rem;
    border: none;
    border-radius: 6px;
    background: linear-gradient(135deg, var(--accent-teal), var(--accent-indigo));
    color: white;
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.analyze-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(45, 212, 191, 0.3);
}

.analyze-btn:active {
    transform: translateY(0);
}

.hidden {
    display: none !important;
}

/* Results section */
.primer-results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 1.5rem;
    align-items: start;
    margin-bottom: 1.5rem;
}

.primer-results-grid .glass-card {
    margin-bottom: 0; /* Let the grid gap handle spacing */
}

.primer-title {
    color: var(--accent-indigo);
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
}

.sequence-display {
    font-family: var(--font-mono);
    color: var(--text-secondary);
    background: rgba(0,0,0,0.3);
    padding: 0.6rem;
    border-radius: 6px;
    word-break: break-all;
    margin-bottom: 1rem;
    letter-spacing: 0.5px;
    font-size: 0.9rem;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.metric-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 0.8rem;
    text-align: center;
    transition: transform 0.3s ease;
}

.metric-card:hover {
    transform: translateY(-3px);
}

.score-card {
    text-align: center;
}

.score-card .metric-breakdown {
    text-align: left;
}

.metric-title {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.3rem;
}

.metric-value {
    font-size: 1.3rem;
    font-weight: 700;
}

.metric-breakdown {
    margin-top: 0.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 0.45rem;
}

.metric-breakdown summary {
    cursor: pointer;
    font-size: 0.72rem;
    color: var(--text-secondary);
    list-style: none;
    user-select: none;
}

.metric-breakdown summary::-webkit-details-marker {
    display: none;
}

.metric-breakdown summary::before {
    content: '▶';
    display: inline-block;
    margin-right: 0.35rem;
    font-size: 0.6rem;
    transition: transform 0.2s ease;
}

.metric-breakdown[open] summary::before {
    transform: rotate(90deg);
}

.score-penalties {
    list-style: none;
    margin-top: 0.45rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    padding-left: 0;
}

.score-penalty-item,
.score-penalty-empty {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-size: 0.72rem;
    line-height: 1.35;
    color: var(--text-secondary);
}

.score-penalty-points {
    min-width: 2rem;
    color: var(--status-red);
    font-weight: 700;
}

.score-penalty-text {
    flex: 1;
}

.section-divider {
    color: var(--accent-teal);
    border-bottom: 1px solid var(--card-border);
    margin-bottom: 0.6rem;
    padding-bottom: 0.3rem;
    font-size: 1rem;
}

.status-green { color: var(--status-green) !important; }
.status-yellow { color: var(--status-yellow) !important; }
.status-red { color: var(--status-red) !important; }
.status-default { color: var(--text-primary); }

.text-output {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.4;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 6px;
    padding: 0.8rem;
    margin-bottom: 1.5rem;
}

.text-checks {
    background: transparent;
    padding: 0;
    margin-bottom: 0.5rem;
}

.check-item {
    display: flex;
    justify-content: space-between;
    padding: 0.4rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.check-item:last-child {
    border-bottom: none;
}

.alignment-block {
    background: rgba(0, 0, 0, 0.4);
    border-radius: 6px;
    padding: 0.8rem;
    margin-bottom: 0.8rem;
    overflow-x: auto;
}

.alignment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 0.6rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 0.4rem;
}

.structure-metrics {
    display: inline-flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.9rem;
    flex-wrap: wrap;
}

.alignment-code {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    line-height: 1.3;
    white-space: pre;
    color: var(--text-primary);
}

.alignment-note-text {
    color: var(--text-secondary);
}

.dimer-loop-base {
    color: var(--text-secondary);
}

.dimer-loop-bridge {
    color: rgba(255, 255, 255, 0.95);
}

.match-wc { color: var(--accent-teal); font-weight: bold; }
.match-wobble { color: var(--status-yellow); }
.match-mm { color: var(--status-red); }